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Platinum group elements (Pt and Ir) deposition at Dome C (East Antarctica) between 572 kyr BP to 800 kyr BP

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Title
Platinum group elements (Pt and Ir) deposition at Dome C (East Antarctica) between 572 kyr BP to 800 kyr BP
Other Titles
EPICA Dome C 빙하 코어를 이용한 지난 57-80만년 동안의 대기 백금족원소의 변화 연구
Authors
C. Barbante
Hwang, Heejin
Hong, Sungmin
C.F. Boutron
P.Gabrielli
Hur, Soon Do
Tseren-Ochir, Soyol-Erdene
Keywords
PGE; cosmogenic; crustal; dust; flux
Issue Date
2012
Citation
C. Barbante, et al. 2012. Platinum group elements (Pt and Ir) deposition at Dome C (East Antarctica) between 572 kyr BP to 800 kyr BP. American Geophysical Union. American Geophysical Union. 2012.12.03~.
Abstract
Platinum group elements (PGE: Ir and Pt) concentrations were determined in 42 sections from the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core, covering a period from ~572 kyr BP to ~800 kyr BP, by inductively coupled plasma sector field mass spectrometry (ICP-SFMS) coupled with desolvation nebulizion system and sub-boiling pre-concentration. Our data enable us to extend the previous EPICA Dome C (EDC) records of Ir and Pt covering the past 270 kyr, which corresponds to the last two climatic cycles. Here we discuss the Ir and Pt concentration records coupling with crustal reference element (Ba) and some refractory trace metals (Yb and Hf). Crustal enriched elements (Ba, Yb and Hf) show well defined variations in concentrations in relation to climatic conditions with lower values during the interglacial periods and much increased values by ~10 during the glacial periods. On the other hand, the siderophile elements (Ir and Pt) show a less differences between their concentrations for different climatic conditions. Mean concentrations of Ir and Pt for the glacial periods were approximately two times higher than their mean concentrations for the interglacial periods. Concentration ratios (Ir/Pt) and crustal enrichment factors (EFc) of Ir and Pt indicate that atmospheric PGE in Antarctica originated dominantly from non-crustal source (i.e., extraterrestrial), and the extenpled plasma sector field mass spectrometry (ICP-SFMS) coupled with desolvation nebulizion system and sub-boiling pre-concentration. Our data enable us to extend the previous EPICA Dome C (EDC) records of Ir and Pt covering the past 270 kyr, which corresponds to the last two climatic cycles. Here we discuss the Ir and Pt concentration records coupling with crustal reference element (Ba) and some refractory trace metals (Yb and Hf). Crustal enriched elements (Ba, Yb and Hf) show well defined variations in concentrations in relation to climatic
URI
http://repository.kopri.re.kr/handle/201206/8393
Conference Name
American Geophysical Union
Conference Place
American Geophysical Union
Conference Date
2012.12.03~
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